This is written with the Seti_UI package installed.
Navigate to the Sublime Text 3/Packages/Seti_UI/icons/
directory.
If a image file (.png
) already exists for your new file extension,
then copy the Prefs/icon_<existing_filetype>.tmPreferences
replacing the current existing_filetype
with the new filetype name.
In the file change the scope and the string to match the existing filetype.